Want to do EI and CI? With Biospect, you can change your mind every 5 or 10 seconds. One sample, two spectra. Chemical ionization and electron impact. With Biospect's dual source you can have both. The changeover can be done quickly and easily—EI to CI in 5 seconds, CI to EI in 10 seconds. In this one machine you now have all the outstanding advantages of CI mass spectrometry as well as rapid access to EI. Plus you get all the advantages of CIMS: • a remarkably high percentage of sample ionization • production of stable, even-electron sample ions • minimal sample ion fragmentation • utmost sensitivity • operator control of sample ion fragmentation • selectivity in ionization
• clearer differentiation between molecules with identical weights but different structural configurations Biospect can be equipped with our new Fast Mass Marker to simplify interpretation of both your hard-copy printout and oscilloscope displayed spectrum. The Fast Mass Marker routinely displays a reference mark at every 2, 10, and 100 amu, or it may be preset to mark at a specific mass number that requires your special attention. New rapid CI^EI^»CI switching capabilities, Fast Mass Markers . . . excellent reasons to choose Biospect. But the best reason is still trie fact that Biospect is the only mass spectrometer built from the ground up as a chemical ionization mass spectrometerbuilt to operateatJEesource-to-analyzer
pressure differential required to generate peak CI spectra. Still debating? Get the details on Biospect and settle your mind, once and for all. CIRCLE 214 O N READER SERVICE CARD
SEARLE Scientific Research Instruments Corp. a subsidiary of G.D. Searle & Co. 6707 Whitestone Road/Baltimore, Maryland 21207 (301) 944-4020 In Canada: Searle Instrumentation Division of G.D. Searle & Co., Ltd. 400 Iroquois Shore Road/Oakville, Ontario L6H 1M5 Γ416) 844-8122 Biospect is a trademark of Scientific Research Instruments.
